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surface.cpp

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-11-1/graphics/surface.cpp $
 * $Id: surface.cpp 30944 2008-02-23 22:50:18Z sev $
 */

#include "common/algorithm.h"
#include "common/util.h"
#include "graphics/primitives.h"
#include "graphics/surface.h"

namespace Graphics {

template<typename T>
static void plotPoint(int x, int y, int color, void *data) {
      Surface *s = (Surface *)data;
      if (x >= 0 && x < s->w && y >= 0 && y < s->h) {
            T *ptr = (T *)s->getBasePtr(x, y);
            *ptr = (T)color;
      }
}

void Surface::drawLine(int x0, int y0, int x1, int y1, uint32 color) {
      if (bytesPerPixel == 1)
            Graphics::drawLine(x0, y0, x1, y1, color, plotPoint<byte>, this);
      else if (bytesPerPixel == 2)
            Graphics::drawLine(x0, y0, x1, y1, color, plotPoint<uint16>, this);
      else
            error("Surface::drawLine: bytesPerPixel must be 1 or 2");
}

00050 void Surface::create(uint16 width, uint16 height, uint8 bytesPP) {
      free();

      w = width;
      h = height;
      bytesPerPixel = bytesPP;
      pitch = w * bytesPP;

      pixels = calloc(width * height, bytesPP);
      assert(pixels);
}

00062 void Surface::free() {
 	::free(pixels);
      pixels = 0;
      w = h = pitch = 0;
      bytesPerPixel = 0;
}

void Surface::hLine(int x, int y, int x2, uint32 color) {
      // Clipping
      if (y < 0 || y >= h)
            return;

      if (x2 < x)
            SWAP(x2, x);

      if (x < 0)
            x = 0;
      if (x2 >= w)
            x2 = w - 1;

      if (x2 < x)
            return;

      if (bytesPerPixel == 1) {
            byte *ptr = (byte *)getBasePtr(x, y);
            memset(ptr, (byte)color, x2-x+1);
      } else if (bytesPerPixel == 2) {
            uint16 *ptr = (uint16 *)getBasePtr(x, y);
            Common::set_to(ptr, ptr + (x2-x+1), (uint16)color);
      } else {
            error("Surface::hLine: bytesPerPixel must be 1 or 2");
      }
}

void Surface::vLine(int x, int y, int y2, uint32 color) {
      // Clipping
      if (x < 0 || x >= w)
            return;

      if (y2 < y)
            SWAP(y2, y);

      if (y < 0)
            y = 0;
      if (y2 >= h)
            y2 = h - 1;

      if (bytesPerPixel == 1) {
            byte *ptr = (byte *)getBasePtr(x, y);
            while (y++ <= y2) {
                  *ptr = (byte)color;
                  ptr += pitch;
            }
      } else if (bytesPerPixel == 2) {
            uint16 *ptr = (uint16 *)getBasePtr(x, y);
            while (y++ <= y2) {
                  *ptr = (uint16)color;
                  ptr += pitch/2;
            }
      } else {
            error("Surface::vLine: bytesPerPixel must be 1 or 2");
      }
}

void Surface::fillRect(Common::Rect r, uint32 color) {
      r.clip(w, h);

      if (!r.isValidRect())
            return;

      int width = r.width();
      int height = r.height();
//    int i;

      if (bytesPerPixel == 1) {
            byte *ptr = (byte *)getBasePtr(r.left, r.top);
            while (height--) {
                  memset(ptr, (byte)color, width);
                  ptr += pitch;
            }
      } else if (bytesPerPixel == 2) {
            uint16 *ptr = (uint16 *)getBasePtr(r.left, r.top);
            while (height--) {
                  Common::set_to(ptr, ptr + width, (uint16)color);
                  ptr += pitch/2;
            }
      } else {
            error("Surface::fillRect: bytesPerPixel must be 1 or 2");
      }
}

void Surface::frameRect(const Common::Rect &r, uint32 color) {
      hLine(r.left, r.top, r.right-1, color);
      hLine(r.left, r.bottom-1, r.right-1, color);
      vLine(r.left, r.top, r.bottom-1, color);
      vLine(r.right-1, r.top, r.bottom-1, color);
}

// FIXME: LordHoto asks why is this in Surface, since this
// just supports 8bpp surfaces. Looks like someone wants
// to subclass Surface to add this or it should be extended
// to support 16bpp (or marked as just working for 8bpp
// surfaces).
void Surface::move(int dx, int dy, int height) {
      // This function currently just works with 8bpp surfaces
      assert(bytesPerPixel == 1);

      // Short circuit check - do we have to do anything anyway?
      if ((dx == 0 && dy == 0) || height <= 0)
            return;

      byte *src, *dst;
      int x, y;

      // vertical movement
      if (dy > 0) {
            // move down - copy from bottom to top
            dst = (byte *)pixels + (height - 1) * w;
            src = dst - dy * w;
            for (y = dy; y < height; y++) {
                  memcpy(dst, src, w);
                  src -= w;
                  dst -= w;
            }
      } else if (dy < 0) {
            // move up - copy from top to bottom
            dst = (byte *)pixels;
            src = dst - dy * w;
            for (y = -dy; y < height; y++) {
                  memcpy(dst, src, w);
                  src += w;
                  dst += w;
            }
      }

      // horizontal movement
      if (dx > 0) {
            // move right - copy from right to left
            dst = (byte *)pixels + (w - 1);
            src = dst - dx;
            for (y = 0; y < height; y++) {
                  for (x = dx; x < w; x++) {
                        *dst-- = *src--;
                  }
                  src += w + (w - dx);
                  dst += w + (w - dx);
            }
      } else if (dx < 0)  {
            // move left - copy from left to right
            dst = (byte *)pixels;
            src = dst - dx;
            for (y = 0; y < height; y++) {
                  for (x = -dx; x < w; x++) {
                        *dst++ = *src++;
                  }
                  src += w - (w + dx);
                  dst += w - (w + dx);
            }
      }
}

} // End of namespace Graphics

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